[#657] CDT cannot be built on Java 21 due to security manager changes

* change BREE to JavaSE-21
* Remove config generation for debug application
* Remove `org.eclipse.osgi.services` from `proxy.server` product

Signed-off-by: Alexander Fedorov <alexander.fedorov@arsysop.ru>

.github/workflows/build-test.yml

@@ -21,10 +21,10 @@ jobs:
             - 'dsf/**'
             - 'debug/**'
             - 'jtag/**'
-    - name: Set up JDK 17
+    - name: Set up JDK 21
       uses: actions/setup-java@v3
       with:
-        java-version: '17'
+        java-version: '21'
         distribution: 'temurin'
         cache: maven
     - name: Set up Maven

.github/workflows/code-cleanliness.yml

@@ -11,10 +11,10 @@ jobs:
     - uses: actions/checkout@v3
       with:
         fetch-depth: 0
-    - name: Set up JDK 17
+    - name: Set up JDK 21
       uses: actions/setup-java@v3
       with:
-        java-version: '17'
+        java-version: '21'
         distribution: 'temurin'
         cache: maven
     - name: Set up Maven